Tumor-targeting functionalized quantum dot and preparation method thereof

Abstract

The invention, which belongs to the field of biochemistry, relates to a tumor-targeting functionalized quantum dot and a preparation method thereof. The functionalized quantum dot consists of folic acid, cyclodextrin and quantum dot, and part of folic acid molecules are contained in the hydrophobic cavity of the cyclodextrin to form folic acid-cyclodextrin inclusion compound, which is then combined with the surface of the quantum dot. In the process of preparing the functionalized quantum dot, the folic acid is first combined with the Gamma-cyclodextrin to form the inclusion compound, and the Gamma-cyclodextrin-folic acid inclusion compound is then modified on the surface of the quantum dot, so that the dual-function nano material with excellent fluorescent characteristic and tumor-targeting property is produced. Since the Gamma-cyclodextrin is used to include the folic acid, the water-solubility and dispersibility of the folic acid are improved. The folic acid and the quantum dot are connected together by an effective method, and the produced fluorescent probe can be used for biological research on tumor cells. The preparation method is simple, the cost is low, and the screening of a variety of tumor cells and an in-vivo experiment on mice indicate that the material is characterized by low toxicity, high selectivity and the like.

Description

technical field

[0001] The invention belongs to the field of biochemistry, and in particular relates to a functionalized quantum dot for specifically recognizing tumor cells and a preparation method thereof. Background technique

[0002] Tumor is the number one disease of human beings. The early diagnosis and treatment of tumors is an important part of human health. At present, the research on the pathogenesis and treatment methods of tumors has become the focus of attention in the medical field. higher and higher requirements. Tumor-targeted probe molecules are an important means of researching and treating tumors in recent years.

[0003] Folic acid is an important substance for preparing tumor-targeting probe molecules. The folate receptor is a glycoprotein receptor that is overexpressed in many tumor cells and barely expressed in the vast majority of normal tissues. Folate has a high affinity for folate receptors, so this feature can be used as a targeting ligand for ...

Examples

Embodiment 1

[0030] Synthesis of folic acid-γ-cyclodextrin inclusion compound: Dissolve 0.5 mmol of folic acid in 10 ml of dimethyl sulfoxide, add 0.5 mmol of γ-cyclodextrin in the dark under nitrogen protection, 50 Stir at ℃ for 24 hours. After the reaction is completed, add a large amount of acetone to the reaction solution to precipitate a light yellow solid, which is centrifuged to obtain a light yellow solid, which is dissolved in hot water and filtered to remove insoluble matter. Cool in the refrigerator overnight, centrifuge to obtain a relatively pure light yellow solid, and then recrystallize 2-3 times to obtain a pure folic acid-γ-cyclodextrin inclusion compound, and the product is vacuum-dried.

Embodiment 2

[0032] Synthesis of quantum dots modified by folic acid-γ-cyclodextrin inclusion complex: 100 mg of folic acid-γ-cyclodextrin inclusion complex was dissolved in 5 ml of N, N-dimethylformamide (concentration of 11.5 mmol per liter), then add 5 milliliters of quantum dots with a concentration of 0.001 mole per liter of chloroform solution, then add 0.0005 milliliters of triethylamine to make the pH value of the reaction solution greater than 10, ultrasonic for 4 hours, after the reaction is completed, add a large amount of ethyl acetate to obtain Precipitate, centrifuge to remove the supernatant, then wash with ethyl acetate three times, and centrifuge to obtain a light red solid substance, which is the quantum dot nanocomposite modified by folic acid-γ-cyclodextrin inclusion compound.

[0033] The functionalized quantum dots obtained in the above examples are used in the screening of various tumor cells and in vivo experiments in mice, showing that the functional nanomaterials h...

technical field

[0001] The invention belongs to the field of biochemistry, and in particular relates to a functionalized quantum dot for specifically recognizing tumor cells and a preparation method thereof. Background technique

[0002] Tumor is the number one disease of human beings. The early diagnosis and treatment of tumors is an important part of human health. At present, the research on the pathogenesis and treatment methods of tumors has become the focus of attention in the medical field. higher and higher requirements. Tumor-targeted probe molecules are an important means of researching and treating tumors in recent years.

[0003] Folic acid is an important substance for preparing tumor-targeting probe molecules. The folate receptor is a glycoprotein receptor that is overexpressed in many tumor cells and barely expressed in the vast majority of normal tissues. Folate has a high affinity for folate receptors, so this feature can be used as a targeting ligand for ...

Examples

Embodiment 1

[0030] Synthesis of folic acid-γ-cyclodextrin inclusion compound: Dissolve 0.5 mmol of folic acid in 10 ml of dimethyl sulfoxide, add 0.5 mmol of γ-cyclodextrin in the dark under nitrogen protection, 50 Stir at ℃ for 24 hours. After the reaction is completed, add a large amount of acetone to the reaction solution to precipitate a light yellow solid, which is centrifuged to obtain a light yellow solid, which is dissolved in hot water and filtered to remove insoluble matter. Cool in the refrigerator overnight, centrifuge to obtain a relatively pure light yellow solid, and then recrystallize 2-3 times to obtain a pure folic acid-γ-cyclodextrin inclusion compound, and the product is vacuum-dried.

Embodiment 2

[0032] Synthesis of quantum dots modified by folic acid-γ-cyclodextrin inclusion complex: 100 mg of folic acid-γ-cyclodextrin inclusion complex was dissolved in 5 ml of N, N-dimethylformamide (concentration of 11.5 mmol per liter), then add 5 milliliters of quantum dots with a concentration of 0.001 mole per liter of chloroform solution, then add 0.0005 milliliters of triethylamine to make the pH value of the reaction solution greater than 10, ultrasonic for 4 hours, after the reaction is completed, add a large amount of ethyl acetate to obtain Precipitate, centrifuge to remove the supernatant, then wash with ethyl acetate three times, and centrifuge to obtain a light red solid substance, which is the quantum dot nanocomposite modified by folic acid-γ-cyclodextrin inclusion compound.

[0033] The functionalized quantum dots obtained in the above examples are used in the screening of various tumor cells and in vivo experiments in mice, showing that the functional nanomaterials h...

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